如下内容是实现一个菜单栏以及下拉菜单的制作：
在mainwindow.h中添加如下内容：
1 class QAction;
2 class QMenu;
在pro中添加QT += widgets。QMenu类作为菜单栏，QAction类作为点击菜单栏的下拉菜单使用QMenu类对象的addaction(QAction类的对象)来添加：main.c如下：
1 #include "mainwindow.h"
2
3 int main ( int argc, char *argv[] ) {
4 Q_INIT_RESOURCE ( application ); /* 初始化qrc资源 */
5 QApplication a ( argc, argv );
6 a.setOrganizationName ( "Qtporject" );
7 a.setApplicationName ( "Application hello Example" ); /* 给窗口添加name */
8 MainWindow w;
9 w.show();
10 return a.exec();
11 }
mainwindow.h如下：
1 #ifndef MAINWINDOW_H
2 #define MAINWINDOW_H
3
4 class QPlainTextEdit;
5 class QAction;
6 class QMenu;
7
8 class MainWindow : public QMainWindow {
9 Q_OBJECT
10 public:
11 explicit MainWindow();
12 ~MainWindow();
13 private slots:
14 void test();
15 private:
16 void createActions();
17 void createMenus();
18 QPlainTextEdit *textEdit; /* 文本框 */
19 QMenu *fileMenu; /* file菜单 */
20 /* 定义了file的下拉菜单为new、open、save、saveAS、exit */
21 QAction *newAct;
22 QAction *open;
23 QAction *Save;
24 QAction *saveAs;
25 QAction *exit;
26 };
27
28 #endif // MAINWINDOW_H
mainwindow.cpp如下：
1 #include "mainwindow.h"
2
3 MainWindow::MainWindow() {
4 textEdit = new QPlainTextEdit; /* 创建一个文本编辑器 */
5 setCentralWidget ( textEdit ); /* 设置文本编辑器为中心位置 */
6 createActions(); /* 首先创建file下拉的菜单栏 */
7 createMenus(); /* 再来创建菜单目录，把下拉菜单的内容addaction加入到menu中 */
8 }
9
10 MainWindow::~MainWindow() {
11 }
12
13 void MainWindow::test() {
14 }
15
16 /* file下拉菜单，名字为new、open、Save、saveAs和exit，并且添加了快捷键和图标，以及相应的槽函数 */
17 void MainWindow::createActions() {
18 newAct = new QAction ( QIcon ( ":/image/new.png" ), tr ( "&New" ), this );
19 newAct->setShortcuts ( QKeySequence::New );
20 newAct->setStatusTip ( tr ( "Create a new file" ) );
21 connect ( newAct, SIGNAL ( triggered() ), this, SLOT ( test() ) ); /* New点击事件调用test */
22 open = new QAction ( QIcon ( ":/image/open.png" ), tr ( "&Open" ), this );
23 open->setShortcuts ( QKeySequence::Open );
24 open->setStatusTip ( tr ( "open a new file" ) );
25 connect ( open, SIGNAL ( triggered() ), this, SLOT ( test() ) ); /* 点击Open事件调用test */
26 Save = new QAction ( QIcon ( ":/image/save.png" ), tr ( "&Save" ), this );
27 Save->setShortcuts ( QKeySequence::Save );
28 Save->setStatusTip ( tr ( "Save a new file" ) );
29 connect ( Save, SIGNAL ( triggered() ), this, SLOT ( test() ) ); /* 点击Save事件调用test */
30 saveAs = new QAction ( tr ( "&SaveAs" ), this );
31 saveAs->setShortcuts ( QKeySequence::SaveAs );
32 newAct->setStatusTip ( tr ( "SaveAs a new file" ) );
33 connect ( saveAs, SIGNAL ( triggered() ), this, SLOT ( test() ) ); /* saveAS点击事件调用test */
34 exit = new QAction ( tr ( "&exit" ), this );
35 exit->setShortcuts ( QKeySequence::Close );
36 exit->setStatusTip ( tr ( "exit a new file" ) );
37 connect ( exit, SIGNAL ( triggered() ), this, SLOT ( close() ) ); /* 点击exit事件调用test */
38 }
39
40 void MainWindow::createMenus() {
41 fileMenu = menuBar()->addMenu ( tr ( "&File" ) ); /* 创建一个name为file的菜单栏 */
42 /* 在这个菜单栏添加action即下拉菜单 */
43 fileMenu->addAction ( newAct );
44 fileMenu->addAction ( open );
45 fileMenu->addAction ( Save );
46 fileMenu->addAction ( saveAs );
47 fileMenu->addSeparator(); /* 添加一个分割器 */
48 fileMenu->addAction ( exit ); /* 推出下拉菜单 */
49 }
下文在原来的基础上添加了菜单栏edit、help，以及edit、help的下拉菜单，还添加了file工具栏和edit工具栏。菜单栏及下拉菜单与上面使用的一样，创建菜单栏类如下：
1 QMenu *fileMenu;
2 QMenu *editMenu;
3 QMenu *helpMenu;
下拉菜单的类如下：
1 /* 定义edit的下拉菜单cut、copy、past */
2 QAction *cut;
3 QAction *copy;
4 QAction *past;
5 /* 定义help的下拉菜单about、aboutQt */
6 QAction *about;
7 QAction *aboutQt;
8 edit与help的使用方法为：
9 /* 创建一个name为edit的菜单栏 */
10 editMenu = menuBar()->addMenu ( tr ( "&Edit" ) );
11 /* 在这个菜单栏添加action，即下拉菜单 */
12 editMenu->addAction ( cut );
13 editMenu->addAction ( copy );
14 editMenu->addAction ( past );
15
16 /* 创建一个name为help的菜单栏 */
17 helpMenu = menuBar()->addMenu ( tr ( "&Help" ) );
18 /* 在这个菜单栏添加action，即下拉菜单 */
19 helpMenu->addAction ( about );
20 helpMenu->addAction ( aboutQt );
工具栏使用的使用如下：
1 QToolBar *fileToolBar;
2 QToolBar *editToolBar;
使用方法为：
1 fileToolBar = addToolBar ( tr ( "File" ) );
2 fileToolBar->addAction ( newAct );
3 fileToolBar->addAction ( open ) ；
4 fileToolBar->addAction ( Save );
5 editToolBar = addToolBar ( tr ( "Edit" ) );
6 editToolBar->addAction ( cut );
7 editToolBar->addAction ( copy );
8 editToolBar->addAction ( past );
mainwindow.h如下：
1 #ifndef MAINWINDOW_H
2 #define MAINWINDOW_H
3
4 class QPlainTextEdit;
5 class QAction;
6 class QMenu;
7
8 class MainWindow : public QMainWindow{
9 Q_OBJECT
10 public:
11 explicit MainWindow();
12 ~MainWindow();
13 private slots:
14 void test();
15 private:
16 void createActions();
17 void createMenus();
18 void createToolBars();
19
20 QPlainTextEdit *textEdit; /* 文本框 */
21 /* file菜单 */
22 QMenu *fileMenu;
23 QMenu *editMenu;
24 QMenu *helpMenu;
25 QToolBar *fileToolBar;
26 QToolBar *editToolBar;
27 /* 定义了file的下拉菜单为new、open、save、saveAS和exit */
28 QAction *newAct;
29 QAction *open;
30 QAction *Save;
31 QAction *saveAs;
32 QAction *exit;
33 /* 定义edit的下拉菜单cut、copy、past */
34 QAction *cut;
35 QAction *copy;
36 QAction *past;
37 /* 定义help的下拉菜单about aboutQt */
38 QAction *about;
39 QAction *aboutQt;
40 };
41
42 #endif // MAINWINDOW_H
mainwindow.cpp代码：
1 #include "mainwindow.h"
2
3 MainWindow::MainWindow() {
4 textEdit = new QPlainTextEdit;
5 setCentralWidget ( textEdit );
6 createActions(); /* 首先创建file下拉的菜单栏 */
7 createMenus(); /* 再来创建菜单目录，把下拉菜单的内容addaction加入到menu中 */
8 createToolBars();
9 }
10
11 MainWindow::~MainWindow() {
12 }
13
14 void MainWindow::test() {
15 }
16
17 void MainWindow::createActions() {
18 newAct = new QAction ( QIcon ( ":/image/new.png" ), tr ( "&New" ), this );
19 newAct->setShortcuts ( QKeySequence::New );
20 newAct->setStatusTip ( tr ( "Create a new file" ) );
21 connect ( newAct, SIGNAL ( triggered() ), this, SLOT ( test() ) );
22 open = new QAction ( QIcon ( ":/image/open.png" ), tr ( "&Open" ), this );
23 open->setShortcuts ( QKeySequence::Open );
24 open->setStatusTip ( tr ( "open a new file" ) );
25 connect ( open, SIGNAL ( triggered() ), this, SLOT ( test() ) );
26 Save = new QAction ( QIcon ( ":/image/save.png" ), tr ( "&Save" ), this );
27 Save->setShortcuts ( QKeySequence::Save );
28 Save->setStatusTip ( tr ( "Save a new file" ) );
29 connect ( Save, SIGNAL ( triggered() ), this, SLOT ( test() ) );
30 saveAs = new QAction ( tr ( "&SaveAs" ), this );
31 saveAs->setShortcuts ( QKeySequence::SaveAs );
32 newAct->setStatusTip ( tr ( "SaveAs a new file" ) );
33 connect ( saveAs, SIGNAL ( triggered() ), this, SLOT ( test() ) );
34 exit = new QAction ( tr ( "&exit" ), this );
35 exit->setShortcuts ( QKeySequence::Close );
36 exit->setStatusTip ( tr ( "exit a new file" ) );
37 connect ( exit, SIGNAL ( triggered() ), this, SLOT ( close() ) );
38 cut = new QAction ( QIcon ( ":/image/cut.png" ), tr ( "&Cut" ), this );
39 cut->setShortcuts ( QKeySequence::Cut );
40 cut->setStatusTip ( tr ( "Save a new file" ) );
41 connect ( cut, SIGNAL ( triggered() ), this, SLOT ( test() ) );
42 copy = new QAction ( QIcon ( ":/image/copy.png" ), tr ( "&Copy" ), this );
43 saveAs->setShortcuts ( QKeySequence::Copy );
44 copy->setStatusTip ( tr ( "SaveAs a new file" ) );
45 connect ( copy, SIGNAL ( triggered() ), this, SLOT ( test() ) );
46 past = new QAction ( QIcon ( ":/image/paste.png" ), tr ( "&Paste" ), this );
47 past->setShortcuts ( QKeySequence::Paste );
48 past->setStatusTip ( tr ( "exit a new file" ) );
49 connect ( past, SIGNAL ( triggered() ), this, SLOT ( close() ) );
50 about = new QAction ( tr ( "&about" ), this );
51 about->setStatusTip ( tr ( "SaveAs a new file" ) );
52 connect ( about, SIGNAL ( triggered() ), this, SLOT ( test() ) );
53 aboutQt = new QAction ( tr ( "&aboutQt" ), this );
54 aboutQt->setStatusTip ( tr ( "exit a new file" ) );
55 connect ( aboutQt, SIGNAL ( triggered() ), this, SLOT ( close() ) );
56 }
57
58 void MainWindow::createToolBars() {
59 fileToolBar = addToolBar ( tr ( "File" ) );
60 fileToolBar->addAction ( newAct );
61 fileToolBar->addAction ( open );
62 fileToolBar->addAction ( Save );
63 editToolBar = addToolBar ( tr ( "Edit" ) );
64 editToolBar->addAction ( cut );
65 editToolBar->addAction ( copy );
66 editToolBar->addAction ( past );
67 }
68
69 void MainWindow::createMenus() {
70 fileMenu = menuBar()->addMenu ( tr ( "&File" ) ); /* 创建一个name为file的菜单栏 */
71 /* 在这个菜单栏添加action即下拉菜单 */
72 fileMenu->addAction ( newAct );
73 fileMenu->addAction ( open );
74 fileMenu->addAction ( Save );
75 fileMenu->addAction ( saveAs );
76 fileMenu->addSeparator(); /* 添加一个分割器 */
77 fileMenu->addAction ( exit ); /* 推出下拉菜单 */
78 editMenu = menuBar()->addMenu ( tr ( "&Edit" ) ); /* 创建一个name为edit的菜单栏 */
79 /* 在这个菜单栏添加action即下拉菜单 */
80 editMenu->addAction ( cut );
81 editMenu->addAction ( copy );
82 editMenu->addAction ( past );
83 helpMenu = menuBar()->addMenu ( tr ( "&Help" ) ); /* 创建一个name为help的菜单栏 */
84 /* 在这个菜单栏添加action即下拉菜单 */
85 helpMenu->addAction ( about );
86 helpMenu->addAction ( aboutQt );
87 }
